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Unit Test 222
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Gravity
Terms in this set (15)
The diagram shows two balls released from a device at the same time. The ball on the left falls freely from rest, and the ball on the right is launched horizontally.
Which best compares the vertical motion of the two balls?
Both balls have constant velocity and are acted on by gravity.
Both balls are acted on by gravity and are accelerating downward.
Both balls are pulled downward and have zero acceleration.
Both balls have zero acceleration and have constant velocity.
Both balls are acted on by gravity and are accelerating downward.
Xavier throws a tennis ball to his friend Olaf at a 20° angle relative to the ground with an initial velocity of 18 m/s. The tennis ball travels 30 m until Olaf catches it.
The time the tennis ball was in the air, rounded to the nearest hundredth, is
1.77 s
An object is represented by the dot on the motion map.
Which object is most likely represented by the dot?
a car driving over the top of a hill
a ball on a string that stopped at the top of a vertical loop
a roller coaster car at the top of a vertical loop of track
a bug on the top of a rolling hula hoop
a ball on a string that stopped at the top of a vertical loop
A bicycle tire has a radius of 0.23 m. The tire spins at a constant speed with a centripetal acceleration of 42 m/s2.
What is the tangential speed of the tire?
3.1 m/s
6.5 m/s
9.7 m/s
14 m/s
3.1 m/s
The acceleration due to gravity on Mercury is 3.7 m/s2, which is about six times the acceleration due to gravity on Pluto.
Which statement accurately compares the mass and weight of an object on these two planets?
An object weighs about one-sixth as much and has about one-sixth the mass on Pluto as on Mercury.
An object weighs about one-sixth as much but has the same mass on Pluto as on Mercury.
An object weighs the same but has about one-sixth the mass on Pluto as on Mercury.
An object weighs the same and has the same mass on Pluto as on Mercury.
An object weighs about one-sixth as much but has the same mass on Pluto as on Mercury.
The diagram shows two vectors that point west and north.
What is the magnitude of the resultant vector?
10 meters
50 meters
1200 meters
2500 meters
50 meters
A boat travels in a straight path that is 25° west of north. Which describes the values of the west and north components of the boat's displacement?
Both components are positive numbers.
Both components are negative numbers.
The west component is a negative number, and the north component is a positive number.
The west component is a positive number, and the north component is a negative number.
The west component is a negative number, and the north component is a positive number.
A child on a spinning ride at a playground has a centripetal acceleration of 0.80 m/s2. The child completes a full circle every 4.2 s.
How far from the center of the ride is the child?
0.068 m
0.085 m
0.27 m
0.36 m
0.36 m
A cyclist rides at a constant speed of 4.5 m/s around a curve. If the centripetal acceleration is 29 m/s2, what is the radius of the curve?
0.16 m
0.70 m
6.4 m
34 m
0.70 m
The pitcher on a softball team starts a windup to throw a pitch, as shown.
He wants to throw the pitch level with the ground and in the direction he is facing. At which point should he release the pitch?
W
X
Y
Z
W
Which best illustrates projectile motion?
D
What is the vertical acceleration of a paper airplane that is launched horizontally with an initial velocity of 2.3 m/s?
-9.8 m/s2
0 m/s2
2.3 m/s2
9.8 m/s2
-9.8 m/s2
The gravitational force between two asteroids is 6.2 × 108 N. Asteroid Y has three times the mass of asteroid Z.
If the distance between the asteroids is 2100 kilometers, what is the mass of asteroid Y?
3.7 × 1015 kg
1.1 × 1016 kg
1.4 × 1031 kg
4.1 × 1031 kg
1.1 × 1016 kg
Which formula can be used to find the centripetal acceleration of an orbiting object?
ac =
ac =
ac =
ac =
ac= v^2/r
The table shows data for the planet Uranus.
To the nearest whole number, how much would a 25.0 kg rock weigh on Uranus?
170 N
218 N
430 N
532 N
218 N
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Verified questions
PHYSICS
Metal sphere A is charged negatively and then brought near an uncharged metal sphere B. Both spheres rest on insulating supports, and the humidity is very low. A small, lightweight hollow metal ball, initially uncharged, is suspended from a string and hung between the two spheres. It is observed that the ball swings rapidly back and forth hitting one sphere and then the other. This goes on for 5 seconds, but then the ball stops swinging and hangs between the two spheres. Explain in detail, step by step, why the ball swings back and forth and why it finally stops swinging. Your explanation must include good physics diagrams.
PHYSICS
The oldest artificial satellite still in orbit is Vanguard I, launched March 3, 1958. Its mass is 1.60 kg. Neglecting atmospheric drag, the satellite would still be in its initial orbit, with a minimum distance from the center of the Earth of 7.02 Mm and a speed at this perigee point of 8.23 km/s. For this orbit, find (a) the total energy of the satellite–Earth system and (b) the magnitude of the angular momentum of the satellite. (c) At apogee, find the satellite’s speed and its distance from the center of the Earth. (d) Find the semimajor axis of its orbit. (e) Determine its period.
PHYSICS
In an ionic solution, sodium ions $\left( \mathrm { Na } ^ { + } \right)$ are moving to the right and chloride ions $\left( \mathrm { Cl } ^ { - } \right)$ are moving to the left. In which direction is the current due to the motion of (1) the sodium ions and (2) the chloride ions? (a) Both are to the right. (b) Current due to $\left( \mathrm { Na } ^ { + } \right)$ is to the left; current due to $\mathrm { Cl } ^ { - }$ is to the right. (c) Current due to $\mathrm { Na } ^ { + }$ is to the right; current due to $\mathrm { Cl } ^ { - }$ is to the left. (d) Both are to the left.
PHYSICS
X rays of wavelength 0.0100 nm are directed in the positive direction of an x axis onto a target containing loosely bound electrons. For Compton scattering from one of those electrons, at an angle of 180°, what are (a) the Compton shift, (b) the corresponding change in photon energy, (c) the kinetic energy of the recoiling electron, and (d) the angle between the positive direction of the x axis and the electron’s direction of motion?